CN112708838B - Preparation method of high-strength nickel-copper alloy cold-drawing aging bar - Google Patents
Preparation method of high-strength nickel-copper alloy cold-drawing aging bar Download PDFInfo
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- CN112708838B CN112708838B CN202011371118.7A CN202011371118A CN112708838B CN 112708838 B CN112708838 B CN 112708838B CN 202011371118 A CN202011371118 A CN 202011371118A CN 112708838 B CN112708838 B CN 112708838B
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Abstract
The invention discloses a preparation method of a high-strength nickel-copper alloy cold-drawing aging bar, which comprises the working procedures of multi-fire secondary cold drawing and process heat treatment, low-temperature solid solution treatment and aging treatment; the multi-fire cold drawing and process heat treatment process comprises the following steps: the accumulated deformation of the first cold deformation is 20-40%, and the temperature of the first heat treatment is 550-650 ℃; the accumulated deformation of the second cold deformation is 20-30%, and the temperature of the second heat treatment is 780-870 ℃; the accumulated deformation of the third cold deformation is 15 to 30 percent; the aging treatment process comprises the following steps: two-stage aging is adopted; in the first stage of aging, the bar is hot-charged into a heating furnace of 540-620 ℃ and is kept warm for 10-15 h; and the second stage of aging, cooling to 460-480 ℃ at the speed of 8-10 ℃/h, and preserving heat for 6-8 h. The method can ensure that the material has excellent plasticity and lower corrosion resistance loss while greatly improving the tensile strength and the yield strength of the nickel-copper alloy bar, and can greatly widen the use strength grade of the nickel-copper alloy.
Description
Technical Field
The invention relates to a preparation method of an alloy, in particular to a preparation method of a high-strength nickel-copper alloy cold-drawing aging bar.
Background
The nickel-copper corrosion resistant alloy is widely used due to the excellent corrosion resistance in reducing medium and seawater medium environments, wherein the usage amount of the NiCu28 nickel-copper alloy is the largest, and the alloy contains about 68% of nickel and 28% of iron and belongs to a nickel-copper continuous solid solution austenite structure. But many medium environments need nickel-copper alloy, and application parts need to have higher strong plasticity, such as fasteners, oil pump shafts and the like. The single nickel-copper single-phase structure has excellent corrosion resistance but lower strength; in order to improve the strength of the material on the premise of ensuring the corrosion resistance, a proper amount of elements such as Ti, Al, Si, Nb and the like are added, and the strength of the material is improved by utilizing a precipitated phase; however, the addition of excessive precipitation strengthening elements significantly reduces the plasticity of the material and also significantly reduces the corrosion resistance.
For example, in the conventional precipitation strengthening type nickel-copper alloy Ni68Cu28AlTi, 2.3-3.15% of Al element and 0.3-1.0% of Ti element are added, the strength of the alloy is improved by utilizing the precipitation strengthening effect, and the strength is also improved by adopting the process of 'single-fire secondary cold drawing + aging' or 'single-fire secondary cold drawing + annealing + aging'. Although the highest strength of the traditional cold-drawing strengthening process can be 1250MPa, the grain refining effect is not obvious, cold-working strengthening is introduced more, the plasticity is seriously reduced, and the stress corrosion performance of the material is also reduced. In addition, the addition of a large amount of Al and Ti elements brings great difficulty to the homogenization control of the head and tail components of the electroslag remelting ingot. Therefore, a new preparation method which can greatly improve the tensile strength and the yield strength of the nickel-copper alloy and ensure that the material still has excellent corrosion resistance and plasticity needs to be developed so as to realize the production of high-strength nickel-copper alloy products such as nickel-copper fasteners, high-power oil submersible pump shafts and the like.
Disclosure of Invention
The invention aims to provide a preparation method of a high-strength nickel-copper alloy cold-drawing aging bar, which is used for improving the tensile strength and the yield strength of nickel and ensuring that the material has excellent plasticity and lower corrosion resistance loss.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the method comprises the working procedures of multi-fire secondary cold drawing and process heat treatment, low-temperature solid solution treatment and aging treatment;
the multi-fire cold drawing and process heat treatment process comprises the following steps: the accumulated deformation of the first cold deformation is 20-40%, and the temperature of the first heat treatment is 550-650 ℃; the accumulated deformation of the second cold deformation is 20-30%, and the temperature of the second heat treatment is 780-870 ℃; the accumulated deformation amount of the third cold deformation is 15 to 30 percent.
The low-temperature solid solution temperature of the low-temperature solid solution treatment process is 950-1030 ℃.
The aging treatment process adopts two-stage aging; in the first stage of aging, the bar is hot-charged into a heating furnace of 540-620 ℃ and is kept warm for 10-15 h; and the second stage of aging, cooling to 460-480 ℃ at the speed of 8-10 ℃/h, and preserving heat for 6-8 h.
The high-strength nickel-copper alloy is a precipitation-strengthened NiCu alloy.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: on the basis of preparing a high-quality hot-rolled bar, crystal grains are fully crushed through primary cold deformation (large deformation is 20-40 percent) and annealing and drawing; compared with the traditional nickel-copper alloy cold-drawn bar production process, the invention has the advantages of obvious organization characteristics, grain size control and second-phase fine distribution control, greatly improves the tensile strength and the yield strength of the nickel-copper alloy bar, ensures that the material has excellent plasticity and lower corrosion resistance loss, greatly widens the use strength grade of the nickel-copper alloy, and can be used for producing high-strength nickel-copper corrosion-resistant fasteners, high-strength submersible oil pump shafts and the like The use safety of the material is improved; meanwhile, the process execution difficulty and the requirement on equipment are reduced.
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The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a grain structure diagram of a cold-drawn aged bar of the present invention.
Detailed Description
Examples 1 to 6: the preparation method of the high-strength nickel-copper alloy cold-drawing aging bar comprises the following process flows: vacuum smelting → electroslag remelting → forging cogging → hot rolling bar → solution treatment → multi-fire secondary cold drawing and process heat treatment → low-temperature solution treatment → aging treatment; the respective process steps are as follows.
(1) The vacuum smelting and electroslag remelting process comprises the following steps: smelting a precipitation-strengthened NiCu alloy by using vacuum smelting and electroslag remelting; the precipitation strengthening type NiCu alloy is precipitation strengthening type Ni68Cu28 alloy, and the precipitation strengthening elements can be Ti, Al, Si and/or Nb; the uniformity and the purity of the components of the metallurgical cast ingot are ensured during smelting, and the O content and the N content in the metallurgical cast ingot are less than 10ppm and less than 40 ppm.
(2) Hot rolling a bar: the uniform and fine original matrix structure of the bar is ensured through low-temperature forging and critical complete recrystallization continuous rolling, the forging heating temperature is 1150-1180 ℃, the finish forging heating temperature after cogging is 1050-1160 ℃, the continuous rolling soaking temperature is 1150-1160 ℃, and the continuous rolling is directly rolled without temperature compensation after rough rolling.
(3) A solution treatment process: and carrying out solid solution treatment on the bar obtained by hot rolling, wherein the solid solution temperature is 950-1050 ℃. The specific process parameters from vacuum melting to solution treatment in the examples are shown in Table 1.
Table 1: specific process parameters from vacuum smelting to solution treatment process
(4) The multi-fire secondary cold drawing and process heat treatment process comprises the following steps: the first cold deformation, the crystal grains are fully crushed through the annealing drawing of large deformation, the single drawing or the multiple drawing can be carried out, and the accumulated deformation is 20-40%; the temperature of the first heat treatment is 550-650 ℃. Secondary cold deformation can be performed by single drawing or multiple drawing, and the accumulated deformation is 20-30%; the temperature of the second heat treatment is 780-870 ℃. And (3) performing cold deformation for the third time, ensuring the optimal control of the polygonal fine grains through proper solid solution drawing deformation, wherein the cold deformation can be performed for one time or for multiple times, and the accumulated deformation is 15-30%.
(5) A low-temperature solution treatment process: the low-temperature solid solution temperature is 950-1030 ℃. The specific process parameters of the multi-fire-pass cold drawing and process heat treatment and low-temperature solution treatment procedures described in the examples are shown in table 2.
Table 2: specific technological parameters of multi-fire secondary cold drawing and process heat treatment and low-temperature solution treatment procedures
(6) And (3) aging treatment: two-stage aging is adopted; the first stage of aging, hot charging the bar after low-temperature solid solution to a heating furnace at 540-620 ℃, and preserving heat for 10-15 h; and in the second stage, the temperature is reduced to 460-480 ℃ at the speed of 8-10 ℃/h, the temperature is preserved for 6-8 h, and then the bar is taken out of the furnace for air cooling or cooled along with the furnace, thus obtaining the cold-drawn aging bar. The specific process parameters of the aging treatment process described in each example are shown in table 3.
Table 3: the specific technological parameters of the aging treatment process
(7) The cold-drawn aged bars obtained in the examples were examined and the results are shown in Table 4. FIG. 1 shows the grain structure of the cold-drawn aged bar obtained in example 1, from which FIG. 1 it can be seen that a homogeneous, fine austenite grain structure with partial twinning is obtained by means of three stages of cold deformation and process heat treatment.
Table 4: detection result of obtained cold-drawn aging bar
In table 4, the comparative example is a Ni68Cu28AlTi alloy bar produced using a conventional process.
Claims (2)
1. A preparation method of a high-strength nickel-copper alloy cold-drawing aging bar is characterized by comprising the following steps: the method comprises the working procedures of multi-fire secondary cold drawing and process heat treatment, low-temperature solid solution treatment and aging treatment;
the multi-fire cold drawing and process heat treatment process comprises the following steps: the accumulated deformation of the first cold deformation is 20-40%, and the temperature of the first heat treatment is 550-650 ℃; the accumulated deformation of the second cold deformation is 20-30%, and the temperature of the second heat treatment is 780-870 ℃; the accumulated deformation of the third cold deformation is 15 to 30 percent;
the low-temperature solid solution temperature of the low-temperature solid solution treatment process is 950-1030 ℃;
the aging treatment process comprises the following steps: two-stage aging is adopted; in the first stage of aging, the bar is hot-charged into a heating furnace of 540-620 ℃ and is kept warm for 10-15 h; and the second stage of aging, cooling to 460-480 ℃ at the speed of 8-10 ℃/h, and preserving heat for 6-8 h.
2. The method for preparing the high-strength nickel-copper alloy cold-drawing aged bar according to claim 1, which is characterized by comprising the following steps of: the high-strength nickel-copper alloy is a precipitation-strengthened NiCu alloy.
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